OpenMP support about tesseract HOT 9 CLOSED

committed but it seems that this is only occurrence of OpenMP support...

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Hi, when I try to compile on a Mac with this commit in (for testing #71), I now get the following error:

configure: error: conditional "OPENMP" was never defined.
Usually this means the macro was only invoked conditionally.

from tesseract.

Did you run ./autogen.sh after git pull? Was it without error? Can you provide config.log?

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Here's a config.log for the current master branch after ./autogen.sh && ./configure: https://gist.github.com/c134a55446c99b9702fe

Same process succeeds if I revert bb19f2c.

from tesseract.

I think this may be related to this problem/answer: http://stackoverflow.com/a/32122781
As I believe the conftest should find <omp.h> when given -fopenmp. I'm currently letting the gcc reinstall run, and will report back after.

But also the configure process probably shouldn't fail by default if there's no OpenMP support detected/enabled.

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Confirmed that after brew reinstall gcc --without-multilib, I can use e.g. brew install --HEAD --cc=gcc-5 tesseract and the configure/make will succeed with bb19f2c in. Without --cc=gcc-5 it fails due to the lack of OpenMP support in the current Clang/LLVM compiler shipped with OS X (i.e. the default Mac "gcc").

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Thanks for testing and report. Should be fixed in f331a57.

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@ryanfb, @zdenop
FYI, Clang 3.7 now support OpenMP.

OpenMP 3.1 is fully supported, but disabled by default. To enable it, please use the -fopenmp=libomp command line option.

http://llvm.org/releases/3.7.0/tools/clang/docs/ReleaseNotes.html#openmp-support

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Patches are welcommed ;) Anyway tesseract can use OpenMP only in one place....

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